nook37 - อ้างอิง

เอกสารอ้างอิง

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http://www.suphan.biz/wadtubkradan.htm

http://pirun.ku.ac.th/~b4903203/page4.html

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http://www.khaosod.co.th/view_news.php?newsid=TUROMGIzVXdNekl6TURFMU13PT0=&sectionid=TURNeE9RPT0=&day=TWpBeE1DMHdNUzB5TXc9PQ==